For an upcoming project I needed to set up secure communications using GPG. It’s been a few years since I used this, and I have never used GPG on the Mac before… Turn out, that it’s not trivial to get it running… Here’s a bunch of links that helped me get things working:

• http://macgpg.sourceforge.net/index.html – the main MacPGP website
• it includes this readme to compile under SnowLeopard. The important part is this line: ./configure CC="gcc -arch i386"
• You will at least need the GPGKeychain and the GPG Preference Pane from the page above – it’s precompile and “should just work”
• The GPGMail plugin for SnowLeopard – you can download a ZIP file with the .mailbundle

Then generate your keys (follow the instructions found at Zeitform)

To install the mailbundle, create a folder ~/Library/Mail/Bundles and copy the GPGMail.mailbundle file you downloaded from Github into it. Drop to a terminal and execute the following two command which will enable Bundles in Mail.app.

defaults write com.apple.mail EnableBundles -bool yes
defaults write com.apple.mail BundleCompatibility -int 3
(via blogator)

Now you can start importing public keys from others into you GPG Keychain and sign / encrypt email from Mail.app

Here is my GPG public key 0x3B5F40BE